I know some people who got Lasik and now have to use reading glasses, but their myopia is fixed. Granted, they are in their 40s and I am 25, but they did not need reading glasses before getting the surgery. How many people need reading glasses after receiving the surgery and does this correlate with age?

In addition, I like scuba diving and have read that with some surgeries you cannot go scuba diving after having the surgery. Is this true and with which surgeries?